Steve Allam is a maniac who has ported the VNC client to the Symbian os (P800 screenshot) which is both completely pointless and very very cool :-)

He says he’s looking into a port for the Nokia 6600 in the near future, so my fingers are crossed. You can read more about the product at the imhotek website and if you’ve never played with VNC, you should definitely check out the main support site